diff --git a/pipeless/src/data.rs b/pipeless/src/data.rs
index 94506ef..45daf63 100644
--- a/pipeless/src/data.rs
+++ b/pipeless/src/data.rs
@@ -66,13 +66,10 @@ impl RgbFrame {
     pub fn set_original_pixels(&mut self, original_pixels: ndarray::Array3<u8>) {
         self.original = original_pixels
     }
-    pub fn get_original_pixels(&self) -> &ndarray::Array3<u8> {
-        &self.original
+    pub fn get_original_pixels(&self) -> ndarray::ArrayView3<u8> {
+        self.original.view()
     }
-    pub fn get_modified_pixels(&self) -> &ndarray::Array3<u8> {
-        &self.modified
-    }
-    pub fn get_mutable_pixels(&mut self) -> ndarray::ArrayViewMut3<u8> {
+    pub fn get_modified_pixels(&mut self) -> ndarray::ArrayViewMut3<u8> {
         self.modified.view_mut()
     }
     pub fn update_mutable_pixels(
@@ -148,7 +145,7 @@ impl Frame {
             Frame::RgbFrame(frame) => { frame.set_original_pixels(original_pixels) },
         }
     }
-    pub fn get_original_pixels(&self) -> &ndarray::Array3<u8> {
+    pub fn get_original_pixels(&mut self) -> ndarray::ArrayView3<u8> {
         match self {
             Frame::RgbFrame(frame) => frame.get_original_pixels()
         }
diff --git a/pipeless/src/gst/utils.rs b/pipeless/src/gst/utils.rs
index f5d38dd..03c6650 100644
--- a/pipeless/src/gst/utils.rs
+++ b/pipeless/src/gst/utils.rs
@@ -1,12 +1,12 @@
 use glib::BoolError;
 use gstreamer as gst;
-use log::{error, warn};
+use log::{error, warn, debug};
 
 pub fn create_generic_component(ctype: &str, cname: &str) -> Result<gst::Element, BoolError> {
     let component = gst::ElementFactory::make(ctype)
         .name(cname)
         .build().or_else(|err| {
-            error!("Failed to create component {} of type {}", cname, ctype);
+            debug!("Failed to create component {} of type {}", cname, ctype);
             Err(err)
         });
 
@@ -52,37 +52,6 @@ pub fn fraction_from_caps_structure(
     };
 }
 
-/*
-/// Taginject does not accept the output of taglist.to_string()
-/// this method produces the expected string
-pub fn tag_list_to_string(tag_list: &gst::TagList) -> String {
-    let result: String = tag_list.iter()
-        .filter(|(tag_name, _)| tag_name.to_string() != "taglist")
-        .filter_map(|(tag_name, _)| {
-            let mut formatted_values = Vec::new();
-
-            for i in 0..tag_list.size_by_name(tag_name) {
-                if let Some(tag_value) = tag_list.index_generic(tag_name, i) {
-                    formatted_values.push(format!("{:?}", tag_value));
-                }
-            }
-
-            if !formatted_values.is_empty() {
-                Some(format!("{}={}", tag_name, formatted_values.join(",")))
-            } else {
-                None
-            }
-
-            // FIXME: this loses tag values if there is more than one value in the tag
-            //tag_list.index_generic(tag_name, 0)
-            //    .map(|tag_value| format!("{}={:?}", tag_name, tag_value))
-        })
-        .collect::<Vec<String>>()
-        .join(";");
-
-    result
-}*/
-
 pub fn tag_list_to_string(tag_list: &gst::TagList) -> String {
     let mut formatted_tags: Vec<String> = Vec::new();
 
diff --git a/pipeless/src/output/pipeline.rs b/pipeless/src/output/pipeline.rs
index 771e0cd..33f5abf 100644
--- a/pipeless/src/output/pipeline.rs
+++ b/pipeless/src/output/pipeline.rs
@@ -417,7 +417,7 @@ impl Pipeline {
 
     pub fn on_new_frame(&self, frame: pipeless::data::Frame) -> Result<(), OutputPipelineError>{
         match frame {
-            pipeless::data::Frame::RgbFrame(rgb_frame) => {
+            pipeless::data::Frame::RgbFrame(mut rgb_frame) => {
                 let modified_pixels = rgb_frame.get_modified_pixels();
                 let out_frame_data = modified_pixels.as_slice()
                     .ok_or_else(|| { OutputPipelineError::new("Unable to get bytes data from RGB frame. Is your output image of the same shape as the input?") })?;
diff --git a/pipeless/src/stages/languages/python.rs b/pipeless/src/stages/languages/python.rs
index bbd93af..3306309 100644
--- a/pipeless/src/stages/languages/python.rs
+++ b/pipeless/src/stages/languages/python.rs
@@ -1,6 +1,6 @@
 use log::{error, warn};
 use pyo3::prelude::*;
-use numpy;
+use numpy::{self, ToPyArray};
 
 use crate::{data::{RgbFrame, Frame}, stages::{hook::{HookTrait, HookType}, stage::ContextTrait}, stages::stage::Context, kvs::store};
 
@@ -26,11 +26,11 @@ impl<'source> FromPyObject<'source> for Frame {
 }
 /// Allows the RgbFrame variant of Frame to be converted from Rust to Python
 impl IntoPy<Py<PyAny>> for RgbFrame {
-    fn into_py(self, py: Python) -> Py<PyAny> {
+    fn into_py(mut self, py: Python) -> Py<PyAny> {
         let dict = pyo3::types::PyDict::new(py);
         dict.set_item("uuid", self.get_uuid().to_string()).unwrap();
-        dict.set_item("original", numpy::PyArray3::from_array(py, self.get_original_pixels())).unwrap();
-        dict.set_item("modified", numpy::PyArray3::from_array(py, self.get_modified_pixels())).unwrap();
+        dict.set_item("original", self.get_original_pixels().to_pyarray(py)).unwrap();
+        dict.set_item("modified", self.get_modified_pixels().to_pyarray(py)).unwrap();
         dict.set_item("width", self.get_width()).unwrap();
         dict.set_item("height", self.get_height()).unwrap();
         dict.set_item("pts", self.get_pts().mseconds()).unwrap();
@@ -38,18 +38,19 @@ impl IntoPy<Py<PyAny>> for RgbFrame {
         dict.set_item("duration", self.get_duration().mseconds()).unwrap();
         dict.set_item("fps", self.get_fps()).unwrap();
         dict.set_item("input_ts", self.get_input_ts()).unwrap();
-        dict.set_item("inference_input", numpy::PyArrayDyn::from_array(py, self.get_inference_input())).unwrap();
-        dict.set_item("inference_output", numpy::PyArrayDyn::from_array(py, self.get_inference_output())).unwrap();
+        dict.set_item("inference_input", self.get_inference_input().to_pyarray(py)).unwrap();
+        dict.set_item("inference_output", self.get_inference_output().to_pyarray(py)).unwrap();
         dict.set_item("pipeline_id", self.get_pipeline_id().to_string()).unwrap();
         dict.into()
     }
 }
+
 /// Allows the RgbFrame variant of Frame to be converted from Python to Rust
 impl<'source> FromPyObject<'source> for RgbFrame {
     fn extract(ob: &'source PyAny) -> PyResult<Self> {
-        let original_py_array: &numpy::PyArray3<u8> = ob.get_item("original")?.extract()?;
+        let original_py_array: &numpy::PyArray3<u8> = ob.get_item("original")?.downcast::<numpy::PyArray3<u8>>()?;
         let original_ndarray: ndarray::Array3<u8> = original_py_array.to_owned_array();
-        let modified_py_array: &numpy::PyArray3<u8> = ob.get_item("modified")?.extract()?;
+        let modified_py_array: &numpy::PyArray3<u8> = ob.get_item("modified")?.downcast::<numpy::PyArray3<u8>>()?;
         let modified_ndarray: ndarray::Array3<u8> = modified_py_array.to_owned_array();
 
         let inference_input_ndarray: ndarray::ArrayBase<_, ndarray::Dim<ndarray::IxDynImpl>>;
@@ -153,6 +154,7 @@ impl PythonHook {
         let module_file_name = format!("{}.py", module_name);
         let wrapper_module_name = format!("{}_wrapper", module_name);
         let wrapper_module_file_name = format!("{}.py", wrapper_module_name);
+        // TODO: create a KVS module for python using PYo3 and expose it via pyo3::append_to_inittab!(make_person_module); so users can import it on their hooks
         let wrapper_py_code = format!("
 import {0}
 
@@ -200,7 +202,7 @@ def hook_wrapper(frame, context):
 }
 impl HookTrait for PythonHook {
     /// Executes a Python hook by obtaining the GIL and passes the provided frame and stage context to it
-    fn exec_hook(&self, frame: Frame, _stage_context: &Context) -> Option<Frame> {
+    fn exec_hook(&self, mut frame: Frame, _stage_context: &Context) -> Option<Frame> {
         let py_module = self.get_module();
         let out_frame = Python::with_gil(|py| -> Option<Frame> {
             let stage_context = match _stage_context {
@@ -213,7 +215,7 @@ impl HookTrait for PythonHook {
             };
 
             if let Ok(hook_func) = py_module.getattr(py, "hook_wrapper") {
-                let original_pixels = frame.get_original_pixels().to_owned();
+                let original_pixels = frame.get_original_pixels().to_owned(); // it seems that to_owned implies to copy data
                 // TODO: we will probably need a pool of interpreters to avoid initializing a new one ever time because o cold starts
                 // TODO: this acquires the Python GIL, breaking the concurrency, except when we are running on different cores thanks
                 //       to how we invoke frame processing using the Tokio thread pool, becuase it runs threads on all the cores.
@@ -222,7 +224,7 @@ impl HookTrait for PythonHook {
                     Ok(ret) => {
                         match ret.extract::<Frame>(py) {
                             Ok(mut f) => {
-                                // Avoid the user to accidentally the original frame
+                                // Avoid the user to accidentally modify the original frame
                                 f.set_original_pixels(original_pixels);
                                 return Some(f)
                             },
diff --git a/pipeless/src/stages/path.rs b/pipeless/src/stages/path.rs
index fe8e264..eb5a770 100644
--- a/pipeless/src/stages/path.rs
+++ b/pipeless/src/stages/path.rs
@@ -102,12 +102,7 @@ async fn run_hook(
     frame: Option<pipeless::data::Frame>,
 ) -> Option<pipeless::data::Frame> {
     if let Some(frame) = frame {
-        // Offload CPU bounded task to a worker thread
         let context = stage.get_context();
-        // NOTE: I hcnaged this and it works faster, however the process time is like 4 times bigger
-        // Using spawn_blocking there are not several models instantiated. Using spawn, everal models are instantiated.
-        // Testing without any of those, since we have await -> frames run one after the other
-        // All the cases take the same time to run the whole stream...
         return hook.exec_hook(frame, context).await;
     }